v3.22.2.2
Pension and Postretirement Benefits - Components of Net Periodic (Income) Cost Associated with Pension Plans and Postretirement Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Pension plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0.7 $ 1.3 $ 2.3 $ 3.9
Interest cost 8.8 7.0 26.4 20.7
Expected return on plan assets (19.6) (20.8) (59.4) (62.5)
Amortization of prior service cost (credit) 0.0 0.0 0.0 0.0
Amortization of actuarial loss (gain) 0.0 0.6 0.0 1.7
Net periodic cost (income) (10.1) (11.9) (30.7) (36.2)
Postretirement benefit obligations        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.0 0.0 0.0 0.0
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortization of prior service cost (credit) (0.1) (0.1) (0.3) (0.3)
Amortization of actuarial loss (gain) 0.0 0.0 0.0 0.0
Net periodic cost (income) $ (0.1) $ (0.1) $ (0.3) $ (0.3)